Secondary slave - HD

After a few alterations within my PC, why is it that my second HD is showing as "secondary slave" during start up, and within "My Computer" it shows as "F" drive, after "D" and "E" which are the CD R/W and the DVD Rom..

I have checked the jumper settings and they appear o.k.It is a Deckstar 40GB and the setting options are - Master Active - Slave Active - Cable select - Master/Slave Present.

oldal, thanks for that , but why would it show "Secondary slave" at start up if the Primary slave section still shows "None", and could I change, by removing the two CD/DVD ROMS from their slot, the second HD to show up as "D" and the two ROMS as "E" and "F"